Add a python script and a GitLab CI job to run it. The job is triggered
when the build is complete.
The script retrieves build artifacts for the default/main branch
(currently "kirkstone") in the manifest repo and build artifacts
for the integration branch of merge request.
After that, it compares those builds and creates a summary of the overall
changes. In particular:
size of compressed artifacts (artifacts.zip)
size of built image
difference between manifest files
The summary is reported to stdout and as a comment to the merge request.
Each run of the pipeline means removing the old summary comment and
creating a new one when the build is finished.
